--- libaitio/inc/aitio.h	2012/08/29 13:51:29	1.25
+++ libaitio/inc/aitio.h	2012/09/03 12:18:27	1.25.2.2
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: aitio.h,v 1.25 2012/08/29 13:51:29 misho Exp $
+* $Id: aitio.h,v 1.25.2.2 2012/09/03 12:18:27 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -245,6 +245,8 @@ typedef struct {
 						void *__p = io_realloc(__val->val.string, AIT_LEN(__val) + __l); \
 						if (__p) { \
 							AIT_LEN(__val) += __l; \
+							if (!__val->val.string) \
+								memset(__p, 0, AIT_LEN(__val)); \
 							__val->val.string = __p; \
 							strlcat((char*) __val->val.string, __s, \
 									AIT_LEN(__val)); \
@@ -546,6 +548,15 @@ inline void io_freeVar(ait_val_t ** __restrict val);
  * return: NULL error or new variable, after use free variable with io_freeVar()
  */
 ait_val_t *io_makeVar(ait_type_t type, ...);
+/*
+ * io_sprintfVar() - Builtin string variable from formatted input
+ *
+ * @v = variable
+ * @fmt = format string
+ * @... = argument(s)
+ * return: -1 error or >0 copied bytes to variable
+ */
+int io_sprintfVar(ait_val_t * __restrict v, const char *fmt, ...);
 /*
  * io_hashVar() - Generate hash key for variable from string or value
  *